> Much like age verification
Age verification as a technical concept can be done in a privacy-preserving manner! Whether or not we want age verification is another debate, but let's stop making wrong technical claims about that: it doesn't help.
Divorcing technical detail from how it is used does little good for humanity.
Really, how?
At some point someone will need to issue a key, which at some point will need to be verified against known good signatures.
These signatures will also need to be kept in case of lawsuirs/enforcement, so if somebody gets access they will know you visited that site